The color dependent morphology of the post-AGB star HD 161796 M. Min, S. V. Jeffers, H. Canovas, M. Rodenhuis, C. U. Keller and L. B. F. M. Waters A&A, 554 (2013) A15 Published online: 30 May 2013 DOI: 10.1051/0004-6361/201219967